/*
 * Copyright (C) 2012 DataSymphony (http://datasymphony.com.au)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package au.com.ds.restty.cmd.impl;

import java.io.File;

import au.com.ds.restty.ExecutionContext;
import au.com.ds.restty.cmd.Command;
import au.com.ds.restty.cmd.Template;
import au.com.ds.restty.js.JavaScriptEngine;
import au.com.ds.restty.js.JsObject;
import au.com.ds.restty.util.Utils;

public class TemplateManager {
	private static final String FILE_EXTENSION = ".js";
	private static final String PROTOTYPE_NAME = "_prototype";
	public static final String FLD_NAME = "name";
	
	private JavaScriptEngine mJsEngine;

	public TemplateManager(){
		mJsEngine = JavaScriptEngine.getInstance();
	}
	
	public Command buildCommand(){
		mJsEngine.prepareContextObjects();
		Template prototypeTemplate = compileTemplate(PROTOTYPE_NAME);
		// TODO Check that command doesn't start with "_" - reserve it for prototype commands
		String commandName = ExecutionContext.get().getArguments().getCommandName();
		Template commandTemplate = compileTemplate(commandName); 
		
		return new CommandImpl(prototypeTemplate, commandTemplate);
	}
		
	private Template compileTemplate(String name){
		File file = new File(ExecutionContext.get().getConfig().getTemplatesDir(), name + FILE_EXTENSION);
		String script = Utils.getScript(file);
		
		JsObject command = mJsEngine.execute(script, file.getName()).as(JsObject.class);
		Template template = new TemplateImpl(file.getAbsolutePath(), name, command);
		
		return template;
	}	
}
